High-Sensitivity Image-Sensor-Incorporated Image Intensifier Tube with Charge-Coupled Device for X-Ray Diffraction

Iron/iron oxide-based nanocomposites were prepared by IR laser sensitized pyrolysis ofFe(CO)5and methyl methacrylate (MMA) mixtures. The morphology of nanopowder analyzed by TEM indicated that mainly core-shell structures were obtained. X-ray diffraction techniques evidence the cores as formed mainly by iron/iron oxide crystalline phases. A partially degraded (carbonized) polymeric matrix is suggested for the coverage of the metallic particles. The nanocomposite structure at the variation of the laser density and of the MMA flow was studied. The new materials prepared as thick films were tested for their potential for acting as gas sensors. The temporal variation of the electrical resistance in presence ofNO2, CO, andCO2, in dry and humid air was recorded. Preliminary results show that the samples obtained at higher laser power density exhibit rather high sensitivity towardsNO2detection andNO2selectivity relatively to CO andCO2. An optimum working temperature of200°Cwas found.

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X-ray transmission grating spectrometer with CCD detector for laser plasma studies

Laser and Particle Beams ◽

10.1017/s0263034600003591 ◽

1991 ◽

Vol 9 (2) ◽

pp. 579-591 ◽

Cited By ~ 8

Author(s):

L. Pína ◽

H. Fiedorowicz ◽

M. O. Koshevoi ◽

A. A. Rupasov ◽

B. Rus ◽

...

Keyword(s):

Laser Plasma ◽

Dynamic Range ◽

High Sensitivity ◽

Array Detector ◽

Charge Coupled Device ◽

X Ray ◽

Transmission Grating ◽

Hot Plasma ◽

Ccd Detector ◽

Wet Processing

A program is under way to develop methods and instrumentation based on charge-coupled device (CCD) sensors for hot plasma diagnostics. We have developed a new X-ray spectrometer in which a freestanding X-ray transmission grating is coupled to a CCD linear array detector with electronic digitized readout replacing film and its wet processing. This instrument measures time-integrated pulsed X-ray spectra with moderate spectral resolution (δλ ≤ 0.6 nm) over a broad spectral range (0.3–2 keV) with high sensitivity, linearity, and large dynamic range. The performance of the device was tested using laser plasma as the X-ray source.

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Construction of Two Stable Co(II)-Based Hydrogen-Bonded Organic Frameworks as a Luminescent Probe for Recognition of Fe3+ and Cr2O72− in H2O

Molecules ◽

10.3390/molecules26195955 ◽

2021 ◽

Vol 26 (19) ◽

pp. 5955

Author(s):

Qi-Ying Weng ◽

Ya-Li Zhao ◽

Jia-Ming Li ◽

Miao Ouyang

Keyword(s):

Detection Limit ◽

Aqueous Media ◽

Three Dimensional ◽

Cobalt Atom ◽

High Sensitivity ◽

X Ray Diffraction ◽

Chlorobenzoic Acid ◽

X Ray ◽

Highly Sensitive ◽

Hydrogen Bonded

A pair of cobalt(II)-based hydrogen-bonded organic frameworks (HOFs), [Co(pca)2(bmimb)]n (1) and [Co2(pca)4(bimb)2] (2), where Hpca = p-chlorobenzoic acid, bmimb = 1,3-bis((2-methylimidazol-1-yl)methyl)benzene, and bimb = 1,4-bis(imidazol-1-ylmethyl)benzene were hydrothermally synthesized and characterized through infrared spectroscopy (IR), elemental and thermal analysis (EA), power X-ray diffraction (PXRD), and single-crystal X-ray diffraction (SCXRD) analyses. X-ray diffraction structural analysis revealed that 1 has a one-dimensional (1D) infinite chain network through the deprotonated pca− monodentate chelation and with a μ2-bmimb bridge Co(II) atom, and 2 is a binuclear Co(II) complex construction with a pair of symmetry-related pca− and bimb ligands. For both 1 and 2, each cobalt atom has four coordinated twisted tetrahedral configurations with a N2O2 donor set. Then, 1 and 2 are further extended into three-dimensional (3D) or two-dimensional (2D) hydrogen-bonded organic frameworks through C–H···Cl interactions. Topologically, HOFs 1 and 2 can be simplified as a 4-connected qtz topology with a Schläfli symbol {64·82} and a 4-connected sql topology with a Schläfli symbol {44·62}, respectively. The fluorescent sensing application of 1 was investigated; 1 exhibits high sensitivity recognition for Fe3+ (Ksv: 10970 M−1 and detection limit: 19 μM) and Cr2O72− (Ksv: 12960 M−1 and detection limit: 20 μM). This work provides a feasible detection platform of HOFs for highly sensitive discrimination of Fe3+ and Cr2O72− in aqueous media.

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PERFORMANCE OF pH SENSOR ELECTRODE BASED ON ZnO NRs ON FTO-GLASS SUBSTRATE

Surface Review and Letters ◽

10.1142/s0218625x19501981 ◽

2020 ◽

Vol 27 (08) ◽

pp. 1950198

Author(s):

ABDULQADER D. FAISAL ◽

MOHAMMAD O. DAWOOD ◽

HASSAN H. HUSSEIN ◽

KHALEEL I. HASSOON

Keyword(s):

Seed Layer ◽

Zno Nanorods ◽

Ph Sensor ◽

High Sensitivity ◽

Hydrothermal Growth ◽

X Ray Diffraction ◽

X Ray ◽

Zno Nanocrystals ◽

Electrode Cell ◽

Fto Glass

In this work, ZnO nanorods (ZnO NRs) were successfully synthesized on FTO-glass via hydrothermal technique. Two steps were followed to grow ZnO NRs. In the first step, the seed layer of ZnO nanocrystals was deposited by using a drop cast method. The second step was represented by the hydrothermal growth of ZnO NRs on a pre-coated FTO- glass with the seed layer. The hydrothermal growth was conducted at 90∘C for 2[Formula: see text]h. The resulted structure, morphology and optical properties of the produced layers were analyzed by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) equipped with energy dispersive X-ray (EDX) and UV-visible spectrophotometer, respectively. The analysis confirmed that the ZnO NRs grown by the hydrothermal method have a hexagonal crystal structure which was grown randomly on the FTO surface. The crystallite size was recorded 50[Formula: see text]nm and a slight microstrain (0.142%) was calculated. The bandgap was found to be in the range of 3.14–3.17[Formula: see text]eV. The ZnO NRs have a high density and large aspect ratio. A pH sensor with high sensitivity was fabricated using a two-electrode cell configuration. The ZnO NRs sensor showed the sensitivity of [Formula: see text]59.03[Formula: see text]mV/pH, which is quite promising and close to the theoretical value ([Formula: see text]59.12[Formula: see text]mV/pH).

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Synthesis of Trilaminar Core–Shell Au/α-Fe2O3@SnO2Nanocomposites and their Application for Nonenzymatic Dopamine Electrochemical Sensing

NANO ◽

10.1142/s1793292019501388 ◽

2019 ◽

Vol 14 (11) ◽

pp. 1950138 ◽

Cited By ~ 1

Author(s):

Sai Zhang ◽

Shijun Yue ◽

Jiajia Li ◽

Jianbin Zheng ◽

Guojie Gao

Keyword(s):

Electron Microscopy ◽

High Sensitivity ◽

Electrochemical Sensing ◽

Synthesis Process ◽

Core Shell ◽

X Ray Diffraction ◽

X Ray ◽

Long Term Stability ◽

Transmission Electron

Au nanoparticles anchored on core–shell [Formula: see text]-Fe2O3@SnO2 nanospindles were successfully constructed through hydrothermal synthesis process and used for fabricating a novel nonenzymatic dopamine (DA) sensor. The structure and morphology of the Au/[Formula: see text]-Fe2O3@SnO2 trilaminar nanohybrid film were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The electrochemical properties of the sensor were investigated by cyclic voltammetry and amperometry. The experimental results suggest that the composites have excellent catalytic property toward DA with a wide linear range from 0.5[Formula: see text][Formula: see text]M to 0.47[Formula: see text]mM, a low detection limit of 0.17[Formula: see text][Formula: see text]M (S/[Formula: see text]) and high sensitivity of 397.1[Formula: see text][Formula: see text]A[Formula: see text]mM[Formula: see text][Formula: see text]cm[Formula: see text]. In addition, the sensor exhibits long-term stability, good reproducibility and anti-interference.

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Influence of Nanocrystallinity on Properties of Photodiode and TFT Image Sensor Structure

MRS Proceedings ◽

10.1557/proc-452-913 ◽

1996 ◽

Vol 452 ◽

Cited By ~ 1

Author(s):

A. Kolodziej ◽

S. Nowak ◽

P. Krewniak

Keyword(s):

Deposition Process ◽

Image Sensor ◽

Pin Diode ◽

High Deposition Rate ◽

Laser Crystallization ◽

X Ray Diffraction ◽

Magnetron Deposition ◽

X Ray ◽

Transmission Electron ◽

Sensor Structure

AbstractThis paper reports technological experiments which have strongly affected the properties of the multilayer image sensor structure. The high deposition rate and large hydrogen content during the reactive magnetron deposition process causes nanocrystallization of prepared silicon films. We also report experiments with laser crystallization. The effect of microstructure in a-Si:H films on TFT and pin diode characteristics has been investigated. Crystallinity was confirmed by Raman scattering, small angle X-ray diffraction (SAXD) and transmission electron microscopy (TEM). The parameters of the photodiodes such as quantum efficiency, dark and light currents, etc. have been tested using the measurements of samples in the configuration of a linear image sensor consisting of two rows, 30 to 160 pixels per row, with dimensions 0.1mm2-1mm2.

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Green preparation of carbon dots for Hg2+ detection and cell imaging

Materials Express ◽

10.1166/mex.2020.1843 ◽

2020 ◽

Vol 10 (11) ◽

pp. 1777-1787

Author(s):

Yadian Xie ◽

Shanshan Wang ◽

Ning Fu ◽

Yan Yang ◽

Xingliang Liu ◽

...

Keyword(s):

Photoelectron Spectroscopy ◽

Carbon Dots ◽

High Sensitivity ◽

Amorphous Structure ◽

X Ray Diffraction ◽

X Ray ◽

Carbon And Nitrogen ◽

Transmission Electron ◽

Sensitivity And Selectivity ◽

Ft Ir

Carbon dots (CDs) also nitrogen-doped CDs (N-CDs) were produced by green hydrothermal synthesis using Pea and ethanediamine as the carbon and nitrogen source, separately. Transmission electron microscopy (TEM) images displayed that the prepared CDs and N-CDs were well dispersed, had a spherical morphology. X-ray diffraction (XRD) figures of CDs and N-CDs presented a graphitic amorphous structure. Fourier transform infrared spectroscopy (FT-IR) verified that CDs and N-CDs carried many different hydrophilic groups (for example hydroxyl, carboxyl/carbonyl, amide, amino groups) on the surface, X-ray photoelectron spectroscopy (XPS) together verified this result. However, the optical properties and fluorescence quantum yield for N-CDs were obviously superior to those of CDs. Furthermore, the prepared N-CDs displayed outstanding advantages including low toxicity, satisfactory biocompatibility, and excellent chemical stability. More prominently, the prepared N-CDs could detect Hg2+ ions with high sensitivity and selectivity in both water samples and HeLa cells.

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Structural and Optical Studies of Potential Ferroelectric Crystal: KDP Doped TGS

Journal of Scientific Research ◽

10.3329/jsr.v6i1.16584 ◽

2013 ◽

Vol 6 (1) ◽

pp. 1-9 ◽

Cited By ~ 6

Author(s):

P. R. Deepti ◽

J. Shanti

Keyword(s):

Infrared Detectors ◽

Room Temperature ◽

Grown Crystal ◽

High Sensitivity ◽

Ferroelectric Material ◽

X Ray Diffraction ◽

Optical Studies ◽

Ferroelectric Crystal ◽

X Ray ◽

Vis Spectroscopy

Triglycine sulphate (TGS), an important ferroelectric material has been widely used in the fabrication of high sensitivity infrared detectors at room temperature. Single crystals of KDP doped TGS was grown by slow evaporation method at room temperature in this study. The grown crystal was characterized by UV-Vis spectroscopy, FTIR spectroscopy, powder X-ray diffraction studies, and ferroelectric studies. KDP doped TGS crystals were found to be highly transparent and full faced. The experimental results evidence the suitability of the grown crystal for optoelectronic applications. Keywords: Crystal growth; KDP-doped TGS; Ferroelectric studies © 2014 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. doi: http://dx.doi.org/10.3329/jsr.v6i1.16584 J. Sci. Res. 6 (1), 1-9 (2014)

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